page nesting / level support

README.md

@@ -43,7 +43,7 @@ On the builder following methods can be called:
 ### .withContent(markdownString)
 Put some **Markdown** content to the generated books README.md (initial/intro page).
 
-### .withPage(pageName, pageContent)
+### .withPage(pageName, pageContent[, level])
 Add another book page. Usage like
 ```js
   .withPage('second', 'Second page content')
@@ -64,6 +64,7 @@ it('should add second book page', function(testDone) {
 });
 ```
 
+**Level**: how nested should be this page, optional parameter. ```0``` for top level page, ```1``` for second, ```2``` for third... 
 
 ### .withBookJson(jsObject)
 Put your own ```book.json``` content as a JS object. May contain plugins,

lib/tester.js

@@ -26,7 +26,8 @@ var createBook = function(content, children) {
     .then(function(dirPath) {
 
       var summaryPages = children.map(function(page){
-        return '* ['+page.name+']('+page.name+'.md)';
+        var padding = Array(page.level * 4).join(' ');
+        return padding + '* ['+page.name+']('+page.name+'.md)';
       });
 
       var pagesPromises = children.map(function(page) {
@@ -246,9 +247,12 @@ Builder.prototype.withContent = function(content) {
     return this;
 };
 
-// attach Markdown content to book (currently only to README.md - single page book)
-Builder.prototype.withPage = function(name, content) {
-    this._pages.push({name:name, content:content});
+// attach Markdown content to book
+Builder.prototype.withPage = function(name, content, level) {
+    if(isNaN(level)) {
+      level = 0;
+    }
+    this._pages.push({name:name, content:content, level:level});
     return this;
 };